Steps to reproduce:
{}{{}}1. Create a new project and install the "AI Assistant” package
2. Open “Assistant” window ( AI > Open Assistant)
4. Enter a “/run” command
5. Double-click to highlight the space after the command
6. Press space to replace the highlighted space with a new one
7. Enter any text and observe

Actual results: Entered text is blue
Expected results: Entered text is white

Reproducible with versions: 1.0.0-pre.4 (6000.2.0b2), 1.0.0-pre.5 (6000.2.0b2)
Tested on (OS): macOS Sequoia 15.4 (M4)

Notes:

• Issue is also reproducible if space is replaced when text is already entered
• Issue is not reproducible if space is deleted and added again without highlighting it